Figure 1 | Scientific Reports

Figure 1

From: A device for surveillance of vascular access sites for bleeding: results from a clinical evaluation trial

Figure 1

Illustration of the technical process of monitoring and detection of blood by the BWATCH device. (A) Device placed over a dressing. (B) When moisture is present in the dressing, a change in capacitance is detected and the green light emitting diode (LED) is activated. (C) Haemoglobin (Hb) in the blood absorbs 525 nm wavelength light. When the light sensor does not detect 525 nm light, the alarm is triggered. (D) With other fluids (non-blood), the light sensor detects 525 nm light and no alarm is triggered.

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